\doxysection{C\+:/\+Users/\+ASUS/\+Desktop/dm-\/ctrl\+H7-\/balance-\/9025test/\+Drivers/\+STM32\+H7xx\+\_\+\+HAL\+\_\+\+Driver/\+Src/stm32h7xx\+\_\+hal\+\_\+i2c.c File Reference}
\hypertarget{stm32h7xx__hal__i2c_8c}{}\label{stm32h7xx__hal__i2c_8c}\index{C:/Users/ASUS/Desktop/dm-\/ctrlH7-\/balance-\/9025test/Drivers/STM32H7xx\_HAL\_Driver/Src/stm32h7xx\_hal\_i2c.c@{C:/Users/ASUS/Desktop/dm-\/ctrlH7-\/balance-\/9025test/Drivers/STM32H7xx\_HAL\_Driver/Src/stm32h7xx\_hal\_i2c.c}}


I2C HAL module driver. This file provides firmware functions to manage the following functionalities of the Inter Integrated Circuit (I2C) peripheral\+:  


{\ttfamily \#include "{}stm32h7xx\+\_\+hal.\+h"{}}\newline


\doxysubsection{Detailed Description}
I2C HAL module driver. This file provides firmware functions to manage the following functionalities of the Inter Integrated Circuit (I2C) peripheral\+: 

\begin{DoxyAuthor}{Author}
MCD Application Team
\begin{DoxyItemize}
\item Initialization and de-\/initialization functions
\item IO operation functions
\item Peripheral State and Errors functions
\end{DoxyItemize}
\end{DoxyAuthor}
\begin{DoxyAttention}{Attention}

\end{DoxyAttention}
Copyright (c) 2017 STMicroelectronics. All rights reserved.

This software is licensed under terms that can be found in the LICENSE file in the root directory of this software component. If no LICENSE file comes with this software, it is provided AS-\/\+IS.

\begin{DoxyVerb}==============================================================================
                      ##### How to use this driver #####
==============================================================================
  [..]
  The I2C HAL driver can be used as follows:

  (#) Declare a I2C_HandleTypeDef handle structure, for example:
      I2C_HandleTypeDef  hi2c;

  (#)Initialize the I2C low level resources by implementing the HAL_I2C_MspInit() API:
      (##) Enable the I2Cx interface clock
      (##) I2C pins configuration
          (+++) Enable the clock for the I2C GPIOs
          (+++) Configure I2C pins as alternate function open-drain
      (##) NVIC configuration if you need to use interrupt process
          (+++) Configure the I2Cx interrupt priority
          (+++) Enable the NVIC I2C IRQ Channel
      (##) DMA Configuration if you need to use DMA process
          (+++) Declare a DMA_HandleTypeDef handle structure for
                the transmit or receive stream or channel depends on Instance
          (+++) Enable the DMAx interface clock using
          (+++) Configure the DMA handle parameters
          (+++) Configure the DMA Tx or Rx stream or channel depends on Instance
          (+++) Associate the initialized DMA handle to the hi2c DMA Tx or Rx handle
          (+++) Configure the priority and enable the NVIC for the transfer complete interrupt on
                the DMA Tx or Rx stream or channel depends on Instance

  (#) Configure the Communication Clock Timing, Own Address1, Master Addressing mode, Dual Addressing mode,
      Own Address2, Own Address2 Mask, General call and Nostretch mode in the hi2c Init structure.

  (#) Initialize the I2C registers by calling the HAL_I2C_Init(), configures also the low level Hardware
      (GPIO, CLOCK, NVIC...etc) by calling the customized HAL_I2C_MspInit(&hi2c) API.

  (#) To check if target device is ready for communication, use the function HAL_I2C_IsDeviceReady()

  (#) For I2C IO and IO MEM operations, three operation modes are available within this driver :

  *** Polling mode IO operation ***
  =================================
  [..]
    (+) Transmit in master mode an amount of data in blocking mode using HAL_I2C_Master_Transmit()
    (+) Receive in master mode an amount of data in blocking mode using HAL_I2C_Master_Receive()
    (+) Transmit in slave mode an amount of data in blocking mode using HAL_I2C_Slave_Transmit()
    (+) Receive in slave mode an amount of data in blocking mode using HAL_I2C_Slave_Receive()

  *** Polling mode IO MEM operation ***
  =====================================
  [..]
    (+) Write an amount of data in blocking mode to a specific memory address using HAL_I2C_Mem_Write()
    (+) Read an amount of data in blocking mode from a specific memory address using HAL_I2C_Mem_Read()


  *** Interrupt mode IO operation ***
  ===================================
  [..]
    (+) Transmit in master mode an amount of data in non-blocking mode using HAL_I2C_Master_Transmit_IT()
    (+) At transmission end of transfer, HAL_I2C_MasterTxCpltCallback() is executed and users can
         add their own code by customization of function pointer HAL_I2C_MasterTxCpltCallback()
    (+) Receive in master mode an amount of data in non-blocking mode using HAL_I2C_Master_Receive_IT()
    (+) At reception end of transfer, HAL_I2C_MasterRxCpltCallback() is executed and users can
         add their own code by customization of function pointer HAL_I2C_MasterRxCpltCallback()
    (+) Transmit in slave mode an amount of data in non-blocking mode using HAL_I2C_Slave_Transmit_IT()
    (+) At transmission end of transfer, HAL_I2C_SlaveTxCpltCallback() is executed and users can
         add their own code by customization of function pointer HAL_I2C_SlaveTxCpltCallback()
    (+) Receive in slave mode an amount of data in non-blocking mode using HAL_I2C_Slave_Receive_IT()
    (+) At reception end of transfer, HAL_I2C_SlaveRxCpltCallback() is executed and users can
         add their own code by customization of function pointer HAL_I2C_SlaveRxCpltCallback()
    (+) In case of transfer Error, HAL_I2C_ErrorCallback() function is executed and users can
         add their own code by customization of function pointer HAL_I2C_ErrorCallback()
    (+) Abort a master or memory I2C process communication with Interrupt using HAL_I2C_Master_Abort_IT()
    (+) End of abort process, HAL_I2C_AbortCpltCallback() is executed and users can
         add their own code by customization of function pointer HAL_I2C_AbortCpltCallback()
    (+) Discard a slave I2C process communication using __HAL_I2C_GENERATE_NACK() macro.
         This action will inform Master to generate a Stop condition to discard the communication.


  *** Interrupt mode or DMA mode IO sequential operation ***
  ==========================================================
  [..]
    (@) These interfaces allow to manage a sequential transfer with a repeated start condition
        when a direction change during transfer
  [..]
    (+) A specific option field manage the different steps of a sequential transfer
    (+) Option field values are defined through I2C_XFEROPTIONS and are listed below:
    (++) I2C_FIRST_AND_LAST_FRAME: No sequential usage, functional is same as associated interfaces in
         no sequential mode
    (++) I2C_FIRST_FRAME: Sequential usage, this option allow to manage a sequence with start condition, address
                          and data to transfer without a final stop condition
    (++) I2C_FIRST_AND_NEXT_FRAME: Sequential usage (Master only), this option allow to manage a sequence with
                          start condition, address and data to transfer without a final stop condition,
                          an then permit a call the same master sequential interface several times
                          (like HAL_I2C_Master_Seq_Transmit_IT() then HAL_I2C_Master_Seq_Transmit_IT()
                          or HAL_I2C_Master_Seq_Transmit_DMA() then HAL_I2C_Master_Seq_Transmit_DMA())
    (++) I2C_NEXT_FRAME: Sequential usage, this option allow to manage a sequence with a restart condition, address
                          and with new data to transfer if the direction change or manage only the new data to
                          transfer
                          if no direction change and without a final stop condition in both cases
    (++) I2C_LAST_FRAME: Sequential usage, this option allow to manage a sequance with a restart condition, address
                          and with new data to transfer if the direction change or manage only the new data to
                          transfer
                          if no direction change and with a final stop condition in both cases
    (++) I2C_LAST_FRAME_NO_STOP: Sequential usage (Master only), this option allow to manage a restart condition
                          after several call of the same master sequential interface several times
                          (link with option I2C_FIRST_AND_NEXT_FRAME).
                          Usage can, transfer several bytes one by one using
                            HAL_I2C_Master_Seq_Transmit_IT
                            or HAL_I2C_Master_Seq_Receive_IT
                            or HAL_I2C_Master_Seq_Transmit_DMA
                            or HAL_I2C_Master_Seq_Receive_DMA
                            with option I2C_FIRST_AND_NEXT_FRAME then I2C_NEXT_FRAME.
                           Then usage of this option I2C_LAST_FRAME_NO_STOP at the last Transmit or
                            Receive sequence permit to call the opposite interface Receive or Transmit
                            without stopping the communication and so generate a restart condition.
    (++) I2C_OTHER_FRAME: Sequential usage (Master only), this option allow to manage a restart condition after
                          each call of the same master sequential
                          interface.
                          Usage can, transfer several bytes one by one with a restart with slave address between
                          each bytes using
                            HAL_I2C_Master_Seq_Transmit_IT
                            or HAL_I2C_Master_Seq_Receive_IT
                            or HAL_I2C_Master_Seq_Transmit_DMA
                            or HAL_I2C_Master_Seq_Receive_DMA
                            with option I2C_FIRST_FRAME then I2C_OTHER_FRAME.
                          Then usage of this option I2C_OTHER_AND_LAST_FRAME at the last frame to help automatic
                          generation of STOP condition.

    (+) Different sequential I2C interfaces are listed below:
    (++) Sequential transmit in master I2C mode an amount of data in non-blocking mode using
          HAL_I2C_Master_Seq_Transmit_IT() or using HAL_I2C_Master_Seq_Transmit_DMA()
    (+++) At transmission end of current frame transfer, HAL_I2C_MasterTxCpltCallback() is executed and
          users can add their own code by customization of function pointer HAL_I2C_MasterTxCpltCallback()
    (++) Sequential receive in master I2C mode an amount of data in non-blocking mode using
          HAL_I2C_Master_Seq_Receive_IT() or using HAL_I2C_Master_Seq_Receive_DMA()
    (+++) At reception end of current frame transfer, HAL_I2C_MasterRxCpltCallback() is executed and users can
         add their own code by customization of function pointer HAL_I2C_MasterRxCpltCallback()
    (++) Abort a master or memory IT or DMA I2C process communication with Interrupt using HAL_I2C_Master_Abort_IT()
    (+++) End of abort process, HAL_I2C_AbortCpltCallback() is executed and users can
         add their own code by customization of function pointer HAL_I2C_AbortCpltCallback()
    (++) Enable/disable the Address listen mode in slave I2C mode using HAL_I2C_EnableListen_IT()
          HAL_I2C_DisableListen_IT()
    (+++) When address slave I2C match, HAL_I2C_AddrCallback() is executed and users can
         add their own code to check the Address Match Code and the transmission direction request by master
         (Write/Read).
    (+++) At Listen mode end HAL_I2C_ListenCpltCallback() is executed and users can
        add their own code by customization of function pointer HAL_I2C_ListenCpltCallback()
    (++) Sequential transmit in slave I2C mode an amount of data in non-blocking mode using
          HAL_I2C_Slave_Seq_Transmit_IT() or using HAL_I2C_Slave_Seq_Transmit_DMA()
    (+++) At transmission end of current frame transfer, HAL_I2C_SlaveTxCpltCallback() is executed and
          users can add their own code by customization of function pointer HAL_I2C_SlaveTxCpltCallback()
    (++) Sequential receive in slave I2C mode an amount of data in non-blocking mode using
          HAL_I2C_Slave_Seq_Receive_IT() or using HAL_I2C_Slave_Seq_Receive_DMA()
    (+++) At reception end of current frame transfer, HAL_I2C_SlaveRxCpltCallback() is executed and users can
         add their own code by customization of function pointer HAL_I2C_SlaveRxCpltCallback()
    (++) In case of transfer Error, HAL_I2C_ErrorCallback() function is executed and users can
         add their own code by customization of function pointer HAL_I2C_ErrorCallback()
    (++) Discard a slave I2C process communication using __HAL_I2C_GENERATE_NACK() macro.
         This action will inform Master to generate a Stop condition to discard the communication.

  *** Interrupt mode IO MEM operation ***
  =======================================
  [..]
    (+) Write an amount of data in non-blocking mode with Interrupt to a specific memory address using
        HAL_I2C_Mem_Write_IT()
    (+) At Memory end of write transfer, HAL_I2C_MemTxCpltCallback() is executed and users can
         add their own code by customization of function pointer HAL_I2C_MemTxCpltCallback()
    (+) Read an amount of data in non-blocking mode with Interrupt from a specific memory address using
        HAL_I2C_Mem_Read_IT()
    (+) At Memory end of read transfer, HAL_I2C_MemRxCpltCallback() is executed and users can
         add their own code by customization of function pointer HAL_I2C_MemRxCpltCallback()
    (+) In case of transfer Error, HAL_I2C_ErrorCallback() function is executed and users can
         add their own code by customization of function pointer HAL_I2C_ErrorCallback()

  *** DMA mode IO operation ***
  ==============================
  [..]
    (+) Transmit in master mode an amount of data in non-blocking mode (DMA) using
        HAL_I2C_Master_Transmit_DMA()
    (+) At transmission end of transfer, HAL_I2C_MasterTxCpltCallback() is executed and users can
         add their own code by customization of function pointer HAL_I2C_MasterTxCpltCallback()
    (+) Receive in master mode an amount of data in non-blocking mode (DMA) using
        HAL_I2C_Master_Receive_DMA()
    (+) At reception end of transfer, HAL_I2C_MasterRxCpltCallback() is executed and users can
         add their own code by customization of function pointer HAL_I2C_MasterRxCpltCallback()
    (+) Transmit in slave mode an amount of data in non-blocking mode (DMA) using
        HAL_I2C_Slave_Transmit_DMA()
    (+) At transmission end of transfer, HAL_I2C_SlaveTxCpltCallback() is executed and users can
         add their own code by customization of function pointer HAL_I2C_SlaveTxCpltCallback()
    (+) Receive in slave mode an amount of data in non-blocking mode (DMA) using
        HAL_I2C_Slave_Receive_DMA()
    (+) At reception end of transfer, HAL_I2C_SlaveRxCpltCallback() is executed and users can
         add their own code by customization of function pointer HAL_I2C_SlaveRxCpltCallback()
    (+) In case of transfer Error, HAL_I2C_ErrorCallback() function is executed and users can
         add their own code by customization of function pointer HAL_I2C_ErrorCallback()
    (+) Abort a master or memory I2C process communication with Interrupt using HAL_I2C_Master_Abort_IT()
    (+) End of abort process, HAL_I2C_AbortCpltCallback() is executed and users can
         add their own code by customization of function pointer HAL_I2C_AbortCpltCallback()
    (+) Discard a slave I2C process communication using __HAL_I2C_GENERATE_NACK() macro.
         This action will inform Master to generate a Stop condition to discard the communication.

  *** DMA mode IO MEM operation ***
  =================================
  [..]
    (+) Write an amount of data in non-blocking mode with DMA to a specific memory address using
        HAL_I2C_Mem_Write_DMA()
    (+) At Memory end of write transfer, HAL_I2C_MemTxCpltCallback() is executed and users can
         add their own code by customization of function pointer HAL_I2C_MemTxCpltCallback()
    (+) Read an amount of data in non-blocking mode with DMA from a specific memory address using
        HAL_I2C_Mem_Read_DMA()
    (+) At Memory end of read transfer, HAL_I2C_MemRxCpltCallback() is executed and users can
         add their own code by customization of function pointer HAL_I2C_MemRxCpltCallback()
    (+) In case of transfer Error, HAL_I2C_ErrorCallback() function is executed and users can
         add their own code by customization of function pointer HAL_I2C_ErrorCallback()


   *** I2C HAL driver macros list ***
   ==================================
   [..]
     Below the list of most used macros in I2C HAL driver.

    (+) __HAL_I2C_ENABLE: Enable the I2C peripheral
    (+) __HAL_I2C_DISABLE: Disable the I2C peripheral
    (+) __HAL_I2C_GENERATE_NACK: Generate a Non-Acknowledge I2C peripheral in Slave mode
    (+) __HAL_I2C_GET_FLAG: Check whether the specified I2C flag is set or not
    (+) __HAL_I2C_CLEAR_FLAG: Clear the specified I2C pending flag
    (+) __HAL_I2C_ENABLE_IT: Enable the specified I2C interrupt
    (+) __HAL_I2C_DISABLE_IT: Disable the specified I2C interrupt

   *** Callback registration ***
   =============================================
  [..]
   The compilation flag USE_HAL_I2C_REGISTER_CALLBACKS when set to 1
   allows the user to configure dynamically the driver callbacks.
   Use Functions HAL_I2C_RegisterCallback() or HAL_I2C_RegisterAddrCallback()
   to register an interrupt callback.
  [..]
   Function HAL_I2C_RegisterCallback() allows to register following callbacks:
     (+) MasterTxCpltCallback : callback for Master transmission end of transfer.
     (+) MasterRxCpltCallback : callback for Master reception end of transfer.
     (+) SlaveTxCpltCallback  : callback for Slave transmission end of transfer.
     (+) SlaveRxCpltCallback  : callback for Slave reception end of transfer.
     (+) ListenCpltCallback   : callback for end of listen mode.
     (+) MemTxCpltCallback    : callback for Memory transmission end of transfer.
     (+) MemRxCpltCallback    : callback for Memory reception end of transfer.
     (+) ErrorCallback        : callback for error detection.
     (+) AbortCpltCallback    : callback for abort completion process.
     (+) MspInitCallback      : callback for Msp Init.
     (+) MspDeInitCallback    : callback for Msp DeInit.
   This function takes as parameters the HAL peripheral handle, the Callback ID
   and a pointer to the user callback function.
  [..]
   For specific callback AddrCallback use dedicated register callbacks : HAL_I2C_RegisterAddrCallback().
  [..]
   Use function HAL_I2C_UnRegisterCallback to reset a callback to the default
   weak function.
   HAL_I2C_UnRegisterCallback takes as parameters the HAL peripheral handle,
   and the Callback ID.
   This function allows to reset following callbacks:
     (+) MasterTxCpltCallback : callback for Master transmission end of transfer.
     (+) MasterRxCpltCallback : callback for Master reception end of transfer.
     (+) SlaveTxCpltCallback  : callback for Slave transmission end of transfer.
     (+) SlaveRxCpltCallback  : callback for Slave reception end of transfer.
     (+) ListenCpltCallback   : callback for end of listen mode.
     (+) MemTxCpltCallback    : callback for Memory transmission end of transfer.
     (+) MemRxCpltCallback    : callback for Memory reception end of transfer.
     (+) ErrorCallback        : callback for error detection.
     (+) AbortCpltCallback    : callback for abort completion process.
     (+) MspInitCallback      : callback for Msp Init.
     (+) MspDeInitCallback    : callback for Msp DeInit.
  [..]
   For callback AddrCallback use dedicated register callbacks : HAL_I2C_UnRegisterAddrCallback().
  [..]
   By default, after the HAL_I2C_Init() and when the state is HAL_I2C_STATE_RESET
   all callbacks are set to the corresponding weak functions:
   examples HAL_I2C_MasterTxCpltCallback(), HAL_I2C_MasterRxCpltCallback().
   Exception done for MspInit and MspDeInit functions that are
   reset to the legacy weak functions in the HAL_I2C_Init()/ HAL_I2C_DeInit() only when
   these callbacks are null (not registered beforehand).
   If MspInit or MspDeInit are not null, the HAL_I2C_Init()/ HAL_I2C_DeInit()
   keep and use the user MspInit/MspDeInit callbacks (registered beforehand) whatever the state.
  [..]
   Callbacks can be registered/unregistered in HAL_I2C_STATE_READY state only.
   Exception done MspInit/MspDeInit functions that can be registered/unregistered
   in HAL_I2C_STATE_READY or HAL_I2C_STATE_RESET state,
   thus registered (user) MspInit/DeInit callbacks can be used during the Init/DeInit.
   Then, the user first registers the MspInit/MspDeInit user callbacks
   using HAL_I2C_RegisterCallback() before calling HAL_I2C_DeInit()
   or HAL_I2C_Init() function.
  [..]
   When the compilation flag USE_HAL_I2C_REGISTER_CALLBACKS is set to 0 or
   not defined, the callback registration feature is not available and all callbacks
   are set to the corresponding weak functions.

   [..]
     (@) You can refer to the I2C HAL driver header file for more useful macros
\end{DoxyVerb}
 